Amyl-glycine-anilides



United States Patent 2,790,829 AMYL-GLYCINE-ANILIDES Nils Magnus Liifgren, Lidingo, and Bengt Josef Landqvist, Stockholm, Sweden, assignors to Alttiebolaget Astra, Apotekarnes Kemiska Fabrlker, Sodertalje, Sweden, a company of Sweden No Drawing. Application July 17, 1953, Serial No. 368,814

Claims priority, application Sweden July 18, 1952 5 Claims. (Cl. 260-562) in which R is selected from the group comprising H and CH3, and the group -C5H1t is selected from normal amyl and isoamyl. The invention thus comprises monoamylamino-acetyl-2,6-xyiidide and monoamylamino-acetyl-mesidide, wherein the amyl group is either normal or isoamyl.

The preferred method of manufacturing the local anesthetics referred to consists in reacting an acetic acid derivative of the general formula X-CO-CHa-Y in which X represents an atom or monovalent radical capable of reacting with one H of the amino group of an aniline compound, and Y represents an atom or monovalent radical capable of reacting with one H of the amino group of a primary amyl amine; successively in arbitrary order with a methylated aniline of the general formula in which R is selected from the group comprising H and CH3, and a monoamyl amine to form a monoamylaminoacetyl-anilide of the general formula in which each of R and the group C5H11 respectively has the significance indicated above. In this method each of the atoms or monovalent radicals X and Y represents preferably a halogen atom of the group comprising Cl. Br, and I. Usually, chlorine is to be preferred. X and Y may represent difierent halogens.

The acetic acid derivative is preferably first reacted with the above mentioned methylated aniline and the reaction product is then reacted with the amyl amine to form the corresponding monoamylamino-acetyl-anilide.

2,790,829 Patented Apr. 30, 1957 2 The amyl group may be normal amyl or isoamyl, for instance --CH2.CHa.CH.(CHs)-2.

The invention is illustrated by reference to the following examples, but it is to be understood that it is not limited thereto.

Example 1.-Is0amylamino-aceto-xylidide 1 mol of chloro-aceto-xylidide, 4 mols of isoamyl amine and 550 milliliters water-free xylene were heated in a flask to 100 C. for 5 hours. After cooling, the solution was diluted with an equal volume of absolute ether whereby isoamyl-aminc-hydrochloride precipitated and was then filtered off. From the filtrate, the base isoamylamine-aceto-xylidide was extracted by repeated shakings with phosphoric acid. The phosphoric acid extracts were combined and made alkaline by the addition of concentrated ammonia, whereafter the base was extracted with ether. The ether solution was dried with Na,SO, and the ether was evaporated off. The residue, a yellowcoloured oil, which soon solidified, was recrystallized from n-dibutyl ether. M. P. 44-45" C. Yield 83%. M. P. of the hydrochloride 211-213" C.

Example 2.--Is0amylamino-aceto-mesidide 1 mol of chloro-aceto-mesidide, 4 mols of isoamyl amine and 550 milliliters water-free xylene were heated to 100 C. for 5 hours in a flask provided with reflux condenser. After cooling, the solution was diluted with an equal volume of absolute ether whereby isoamylamino-hydrochloride precipitated. The precipitate was filtered off and the filtrate was repeatedly extracted with acetic acid. The acetic acid extracts were combined and the base isoamylamino-aceto-mesidide was liberated by the addition of concentrated ammonia. The base was extracted with ether and the ether solution was dried with Na,SO,. The ether was then evaporated off, first at pressure and then at 10 millimeters of mercury and a temperature of 100 C. The residue, a yellowcoloured oil, crystallized on cooling. By recrystallization from n-dibutyl ether crystals of M. P. 61-62 C. were obtained. Yield 87%. M. P. of the hydrochloride 236-238 C.

Example 3.nAmylamino-aceto-xylidide 1 mol of chloro-aceto-xylidide, 4 mols of n-amyl amine and 550 milliliters of water-free xylene were heated in a flask to 100 C. for 5 hours. The solvent and the excess of amyl amine were then evaporated oil, first at normal atmospheric pressure and thereafter at 10 Torr. The residue was boiled repeatedly with normal hydrochloric acid, from which the hydrochloride of the desired base precipitated on cooling. The precipitated hydrochloride was filtered and dried. Yield M. P. 2ll2l3 C.

The base n-amylamino-aceto-xylidide was liberated from the hydrochloride by the addition of concentrated ammonia, and was then extracted with ether. The ether solution was then dried. After evaporation of the solvent, a colourless oil was obtained which solidified in the form of crystals. M. P. 43-45 C.

Example 4.-n-Amylamin0-acetomesidide 3 Whatis claimed is: 3. (Monofisoamylaminoacetyl 2,4,6-trimethylanilide. I. A non-toxic, clinically useful lbchl anesthetic of 4. (Mbno normal)amylaminoacetyl 2,6 dimethylthe general formula anilide.

5. (Mono normaUamylaminoacetyI 2,4,6 trimethyl- 5 anilide.

References Cited in the file of this patent UNITED STATES PATENTS Lofgren et a1. May 11, 1948 OTHER REFERENCES Lofgren et aL: "Svensk. Kem. Tid.," vol. 58 (1946), pp. 220, 224 and 225.

2,441,498 in which R is seiected from the group consisting of H 10 and CH3, and the radical -C5H11 is a member of the class consisting of normal amyl and isoamyl.

2. (Mono)isoamylaminoacetyl 2,6-dimethylanilide. 

1. A NON-TOXIC, CLINICALLY USEFUL LOCAL ANETHETIC OF THE GENERAL FORMULA 